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099 percent by weight and showed an inverse relation to aD, which ranged from -55 to -79. 104 percent water and showed a wide aD range of -57 to -91. Inasmuch as the Hawaiian lavas are oceanic basalts, it is difficult to compare these results to the rhyolites . Objections have been raised to using the water in fresh basaltic pumices as a measure of the water present at, or just before eruption. Certainly some water is lost as steam during eruption, but the question remains as to whether this loss is quantitatively negligible or not.

ARNASON et al. (1969) have investigated the Hengill (Iceland) thermal area, and have found that the solfataras and fumaroles that occur mainly at higher elevations are recharged by local rain water, while the hot water springs at lower elevations are fed by a deep aquifer that is being recharged in an active volcanic zone about 70 km to the northeast. f) Ocean Water REDFIELD and FRIEDMAN (1965) published data on the deuterium content of sea water and a discussion of the factors affecting the distribution of deuterium in the oceans.

3 for 4 years. Surface water at the south coast of Iceland has a 15D of -52, Surtsey is 34 km off shore. The local ocean water would have a 15D of approximately O. These analyses may represent the best sample of volcanic water analyzed to date, and may be representative of water in mid-ocean mantle basalt erupting at the present time. b) Juvenile Water Juvenile water is defined as water that has never been part of the hydrologic cycle, but was present at the time of the formation of the earth. As so defined, it has been the Holy Grail of hydrogeochemists, and as such, will probably never be found.